Compositions comprising photo-labile perfume delivery systems

ABSTRACT

The present invention relates to photo-labile pro-fragrances, as well as a fragrance raw material delivery system comprising:  
     i) from about 0.001% to about 100% by weight, of a photo-labile pro-fragrance compound having the formula:  
                 
 
      wherein OR is a unit derived from a fragrance raw material alcohol, HOR; R 1  is one or more electron donating groups; each R 2  is independently hydrogen, C 1 -C 12  alkyl, and mixtures thereof; X is selected from the group consisting of —OH, —NH 2 , —NHR 3 , and mixtures thereof; R 3  is hydrogen, C 1 -C 12  linear or branched alkyl, C 6 -C 10  aryl, and mixtures thereof; and  
     ii) optionally from about 0.001% to about 50% by weight, of one or more fragrance raw materials.

FIELD OF THE INVENTION

[0001] The present invention relates to compositions, inter alia, personal care lotions, laundry detergent compositions, which comprise a photo-labile perfume delivery system capable of releasing fragrance raw material alcohols. The compositions of the present invention can also comprise initial amounts of the releasable fragrance raw material alcohols thereby providing a sustained initial fragrance.

BACKGROUND OF THE INVENTION

[0002] Pro-fragrances and pro-accords have been used to enhance the delivery of fragrance raw materials and to sustain their duration. Typically pro-fragrances and pro-accords deliver alcohol, ketone, aldehyde, and ester fragrance raw materials via substrates which are triggered by one or more release mechanisms, inter alia, the acidic pH of skin, nascent moisture, shift of position of equilibrium.

[0003] Fragrances or odors not only provide a pleasant aesthetic benefit, but also serve as a signal. For example, foods, which have soured or are no longer edible, may develop smells, which are repulsive and send a signal that they are no longer palatable. Therefore, the delivery of an aroma sensory signal is also a benefit, which a pro-fragrance can provide.

[0004] However, pro-fragrances and pro-accords typically rely on the break down of a chemical species not based on accidental circumstance but on deliberate execution. There are examples of fragrance or odor releasing compounds which involve release of fragrances which are initiated by exposure to electromagnetic radiation, inter alia, UV light, however, these compounds do not have a means for controlling the release rate of the fragrances such that the formulator can ensure the fragrances will be release during a period of time which is of benefit to the consumer. The present invention provides a means for delivering fragrance raw material alcohols wherein the delivery of said alcohols is instigated by exposure to light in a manner which allows the formulator to control the rate of alcohol delivery, and control the impact of the photo-fragment by-products.

SUMMARY OF THE INVENTION

[0005] The present invention meets the aforementioned needs in that it has been surprisingly discovered that photo labile compounds can be designed to release fragrance raw materials during a period of time which is useful to the formulator of perfume comprising compositions. One drawback to compounds which release perfumes, photo-labile and otherwise, is the inability to control the release half lives of said compounds. For example, a photo labile pro-fragrance may be capable of releasing a fragrance raw material alcohol, but the release rate is such that the amount of alcohol which is released per unit time is so low that applying a sufficient amount of pro-fragrance necessary to meet aesthetic needs becomes cost prohibited, or is limited by formulation parameters.

[0006] It has now been surprisingly discovered that aryl acrylate photo-labile compounds can be modified in a manner which allows for their utility in fragrance delivery systems. These fragrance delivery systems are useful in a wide array of compositions which deliver, in addition to other benefits, an aesthetic benefit.

[0007] The first aspect of the present invention relates to photo-labile pro-fragrances having the formula:

[0008] wherein —OR is a unit derived from a fragrance raw material alcohol, HOR; R¹ is one or more electron donating groups; each R² is independently hydrogen, C₁-C₁₂ alkyl, C₇-C₁₂ alkylenearyl; and mixtures thereof; X is selected from the group consisting of —OH, —NH₂, —NHR³, and mixtures thereof; R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, C₇-C₁₂ alkylenearyl, and mixtures thereof.

[0009] The second aspect of the present invention relates to a fragrance raw material delivery system comprising:

[0010] i) from about 0.001% to about 100% by weight, of a photo-labile pro-fragrance compound having the formula:

[0011]  wherein R is a unit derived from a fragrance raw material alcohol; R¹ is one or more electron donating groups; each R² is independently hydrogen, C₁-C₁₂ alkyl, C₇-C₁₂ alkylenearyl; and mixtures thereof; X is selected from the group consisting of —OH, —NHR³, and mixtures thereof; R³ is H, C₁-C₁₂ alkyl, C₇-C₁₂ alkylenearyl, and mixtures thereof; and

[0012] ii) optionally from about 0.001% to about 50% by weight, of one or more fragrance raw materials.

[0013] Another aspect of the present invention relates to personal care and laundry and cleaning compositions which comprise the fragrance delivery system of the present invention.

[0014] The present invention further relates to an aspect wherein in addition to the release of a fragrance raw material alcohol, the photo-labile trigger which is released can also itself be a fragrance raw material ingredient.

[0015] A further aspect of the present invention relates to methods for providing an enhanced duration or modified release fragrance.

[0016] These and other objects, features, and advantages will become apparent to those of ordinary skill in the art from a reading of the following detailed description and the appended claims. All percentages, ratios and proportions herein are by weight, unless otherwise specified. All temperatures are in degrees Celsius (° C.) unless otherwise specified. All documents cited are in relevant part, incorporated herein by reference.

DETAILED DESCRIPTION OF THE INVENTION

[0017] The present invention relates to the surprising discovery that aryl acrylate pro-fragrances having the formula:

[0018] which are capable of releasing a fragrance raw material alcohol ROH, can be modified to have release half-lives which are useful to formulators and/or photo-fragment by-products which are useful to formulators.

[0019] The surprising discovery relates to the fact that R¹ units which are electron-donating groups, modulate the rate at which the photo-labile fragrance raw material is released. Without wishing to be limited by theory, the R¹ unit is capable of modulating the first photo-isomerization step and/or the second fragrance raw material elimination step.

[0020] The formulator can choose between combinations of R¹ and/or R² units to achieve the desired modulated release rate.

[0021] For the purposes of the present invention, the term “electron donating group” is defined herein as “functional groups which will tend to donate the electrons which comprise said groups toward another functional unit or bond, inter alia, aromatic rings, said donation of electrons referenced with respect to the propensity of a hydrogen atom to donate its electrons.” Donating groups according to the present invention are —O⁻ (de-protonated hydroxy), —N(R³)₂, —NHR³, —NH₂, —OH, —OR³, —NHC(O)R³, —NR³C(O)R³, —OC(O)R³, —R³, —CH═C(R³)₂, wherein R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, C₇-C₁₂ alkylenearyl, and mixtures thereof.

[0022] The first aspect of electron donating groups as it relates to the present invention comprise units defined herein as “strongly donating units” which are units selected from the group consisting of —O⁻ (de-protonated hydroxy), —N(R³)₂, —NHR³, —NH₂, —OH, and —OR³ wherein R³ is C₁-C₄ alkyl.

[0023] The second aspect of electron donating groups as it relates to the present invention comprise units defined herein as “moderately/weakly donating units” which are units selected from the group consisting of —NHC(O)R³, —NR³C(O)R³, —OC(O)R³, —R³, —CH═C(R³)₂, wherein R³ is a C₁-C₁₂ linear or branched alkyl, phenyl, or benzyl.

[0024] However, for the purposes of the present invention, as indicated herein below, a strongly donating unit and a moderately/weakly donating unit may be contained in the same molecule.

[0025] The present invention also relates to the discovery that aryl acrylate pro-fragrances having the formula:

[0026] which are capable of releasing a fragrance raw material alcohol ROH and the photo-fragment by-product having the formula:

[0027] can be modified such that the photo-fragment by-product is a substituted coumarin derivative having an odor impact level especially useful to the formulators when combined with from about 0.001% to about 50% by weight of one or more fragrance raw materials. The discovery relates to the fact that R¹ units which are electron donating groups, as defined herein above, modulate the odor detection threshold level of the photo-fragment by-product that is released prior to or concomitant to the release of the photo-labile fragrance raw material.

[0028] Each R² is independently hydrogen, C₁-C₁₂ alkyl, C₇-C₁₂ alkylenearyl; and mixtures thereof. One embodiment of the present invention comprises each R² unit as a hydrogen, whereas other embodiments include alkyl, inter alia, methyl, and alkylenearyl, inter alia, benzyl.

[0029] Another embodiment relates to aryl acrylate pro-fragrances where the R¹ and R² units are chosen such that the coumarin derivative released from the aryl acrylate pro-fragrance has an odor detection threshold that is 2 times greater than the odor detection threshold for the corresponding coumarin derivative released from the aryl acrylate pro-fragrance where the R¹ and R² units are all chosen to be hydrogen.

[0030] For the purposes of the present invention X is —OH, —NH₂, or —NHR³; whereas X¹ is the ring closed form of X, namely, —O—, —NH—, and —NR³— respectively.

[0031] Without wishing to be limited by theory, the reaction cascade which releases the fragrance raw material alcohol of the present invention is believed to proceed as follows:

[0032] 1. A first photo-isomerization step:

[0033] 2. A second fragrance raw material elimination step:

[0034] wherein R represents the released fragrance raw material alcohol.

[0035] One embodiment of the present invention relates to R¹ units which are hydroxy. One example of a pro-fragrance wherein X is hydroxy, an R¹ unit is also hydroxy, and both R² units are hydrogen relates to 3-(2,4-dihydroxyphenyl)-acrylate fragrance raw material esters having the formula:

[0036] However, other embodiments include pro-fragrances having an R¹ hydroxy moiety in a ring position other than the 4-position, or to a pro-fragrance having multiple R¹ hydroxy units, for example, a pro-fragrance having the formula:

[0037] A further embodiment relates to R¹ units having the formula —OR³ wherein R³ is C₁-C₁₂ linear or branched alkyl or phenyl, for example, a pro-fragrance having the formula:

[0038] a pro-fragrance having the formula:

[0039] or a pro-fragrance having the formula:

[0040] A further embodiment of the present invention relates to aryl rings substituted with one or more C₁-C₁₂ acyloxy units having the formula R³CO₂—, for example, a pro-fragrance having the formula:

[0041] A further embodiment relates to R¹ units which are —N(R³)₂ units wherein R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, or mixtures thereof, for example, a pro-fragrance having the formula:

[0042] X units relate to aspects of the photo-labile pro-fragrances. A first aspect relates to X units which are —OH and which result in the formation of derivatives of coumarin as reaction by-products. A second aspect wherein X is —NHR³ relates to the formation of derivatives of 2-hydroxyquinoline as reaction by-products. An example of a pro-fragrance wherein X is —NH₂, the R¹ unit is hydroxy, and both R² units are hydrogen relates to 3-(2-amino-4-hydroxyphenyl)-acrylate fragrance raw material esters having the formula:

[0043] In both aspects of X, R² units can be units other than hydrogen, for example C₁ alkyl. One example of an embodiment wherein R² units are non-hydrogen is a pro-fragrance wherein X is hydroxy, each R¹ unit is hydrogen, one R² unit is methyl and the second R² unit is hydrogen is 3-(2-hydroxyphenyl)-3-methyl-acrylate fragrance raw material esters having the formula:

[0044] A further embodiment of the X equal to hydroxy aspect relates an R¹ units which is hydroxy and at least one R² unit which is alkyl. Fore example, 3-(2,4-dihydroxyphenyl)-3-methyl-acrylate having the formula:

[0045] A third aspect of the present invention relates to the selection of R¹, R² and X units such that the rate of ROH fragrance raw material release is increased. One embodiment of this increased release selection relates to pro-fragrances releasing an ROH at a rate at least 1.5 times the rate of an analog having each R¹ and both R² units equal to hydrogen, also defined herein for X equal to hydroxy and amino as the “baseline” or “reference” analogs. Another aspect relates to a selection of moieties such that the rate of fragrance alcohol release is at least twice that rate of release by the corresponding baseline analog. A further embodiment increases the rate at least 3 times faster that the corresponding baseline analog.

[0046] R units are radicals derived from fragrance raw material alcohols. For the purposes of the present invention the term “fragrance raw material alcohol” is defined herein as “any alcohol having a molecular weight of 100 g/mole or greater.”

[0047] For the purposes of the present invention fragrance raw material alcohols are grouped into classes, for example, alcohols which comprise nearly the same structure will have comparable release rates with the same electron donating R¹. A non-limiting example of these similar alcohols include geraniol and nerol which are isomers.

[0048] For the purposes of the present invention the following are defined herein as fragrance raw materials alcohols derived from a terpene: geraniol, nerol, eugenol, isoeugenol, citronellol, menthol, isopulegol, terpineol, borneol, isoborneol, linalool, tetrahydrolinalool, myrcenol, dihydromyrcenol, muguol, farnesol and mixtures thereof. However, the formulator will realize these are not the only terpene raw material alcohols but are those which comprise one embodiment of the present invention.

[0049] Non-limiting examples of R units derived from a non-terpene alcohol include those selected from the group consisting of cinnamyl alcohol, methylcinnamyl alcohol, Majantol, Hydrotropic alcohol, nopol, Lavandulol, carvenol, cuminyl alcohol, thymol, and mixtures thereof.

[0050] For the purposes of the present invention, the following are defined herein as “blossom alcohols”: 4-(1-methylethyl)cyclo-hexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.

[0051] Fragrance raw material alcohols suitable for use in the present invention are described in U.S. Pat. No. 5,919,752 Morelli et al., issued Jul. 6, 1999; U.S. Pat. No. 6,013,618 Morelli et al., issued Jan. 11, 2000; U.S. Pat. No. 6,077,821 Morelli et al., issued Jun. 20, 2000; U.S. Pat. No. 6,087,322 Morelli et al., issued Jul. 11, 2000; U.S. Pat. No. 6,114,302 Morelli et al., issued Sep. 5, 2000; U.S. Pat. No. 6,177,389 Morelli et al., issued Jan. 23, 2001; all of which are incorporated herein by reference.

[0052] The present invention further relates to an aspect wherein in addition to the release of a fragrance raw material alcohol, the photo-labile trigger which is released can also itself be a fragrance raw material ingredient. For example, the material released by the X equals oxygen aspect (coumarin derivatives) may itself be a fine fragrance component, fragrance raw material, or perfume adjunct ingredient. The same is equally true for the X equals nitrogen aspect (2-hydroxyquinoline derivatives).

[0053] Or in another embodiment, the coumarin derivative which is release may provide a different benefit, for example, once the ring closure reaction is complete, the resulting compound may have sufficient conjugation to be a colored material, and therefore serve as a visual signal.

[0054] The following relates to methods for preparing the photo-labile pro-fragrances of the present invention.

[0055] A first procedure relates to the conversion of a starting material having formula 1 to the aryl acrylate photo-labile pro-fragrance 3 by way of the intermediate aryl acrylic acid 2 as depicted in the following scheme:

[0056] In the case wherein X is equal to oxygen (coumarin derivatives) the preparation begins with a von Pechmann condensation as in the example of the reaction of recorcinol with acetoacetic acid ethyl ester depicted in the following scheme:

[0057] Coumarin syntheses are reviewed by Dean, F. M. “Naturally Occurring Oxygen Ring Compounds”; Butterworths: London, 1963; p. 176.

EXAMPLE 1 3-(2,4-Dihydroxyphenyl)Acrylic Acid 1,5-dimethyl-1-vinylhex-4-enyl Ester

[0058] Step (1) preparation of 3-(2,4-dihydroxyphenyl)acrylic acid (5) from 7-hydroxy-chromen-2-one (4):

[0059] To a solution of 20% sodium sulfite (640 g) at 60° C. is added 7-hydroxychromen-2-one (75.0 g, 0.416 mol). The reaction mixture is warmed to 100° C. and stirred for 1.5 h. To this solution is added dropwise 30% KOH solution (301 g). The stirred mixture is cooled to 0° C. and acidified by the slow and careful addition of concentrated HCl, keeping the solution temperature below 10° C. The colorless precipitate is separated by filtration, washed with water and dried for 12 h under vacuum at 45° C. The resulting 3-(2,4-dihydroxyphenyl)-acrylic acid is a colorless solid (24.0 g) and is used without further purification.

[0060] Step (2) preparation of 3-(2,4-Dihydroxyphenyl)-acrylic acid 1,5-dimethyl-1-vinyl-hex-4-enyl ester (6) from 3-(2,4-dihydroxyphenyl)acrylic acid (5).

[0061] To a solution of linalool (1.74 g, 11.3 mmol) and triethylamine (2.30 g, 22.6 mmol) in anhydrous THF (150 mL) stirred for 5 min at 22° C. is added 3-(2,4-dihydroxyphenyl)-acrylic acid (2.04 g, 11.3 mmol). To this heterogeneous solution is added BOP Reagent (5.00 g, 11.3 mmol; Aldrich #22,608-4) in DMF (10 mL), and the subsequent homogeneous reaction mixture is stirred for 1 h. The reaction mixture is partitioned between ether (200 mL) and water (400 mL); the organic layer is removed and washed with ether (200 mL). The combined organic layers are washed sequentially with saturated sodium bicarbonate solution (200 mL) and brine (200 mL). The organic layer is dried over anhydrous magnesium sulfate, vacuum filtered and concentrated to give 3-(2,4-dihydroxyphenyl)-acrylic acid 1,5-dimethyl-1-vinyl-hex-4-enyl ester as an oil that is purified by flash chromatography.

EXAMPLE 2 (E)-3-(2,4-dihydroxyphenyl)-but-2-enoic Acid Phenethyl Ester

[0062] (E)-3-(2,4-dihydroxyphenyl)-but-2-enoic acid phenethyl ester (8) from 3-(2,4-dihydroxyphenyl)-but-2-enoic acid (7):

[0063] To a 0° C. solution of 9.7 g (0.050 mol) of 3-(2,4-dihydroxyphenyl)but-2-enoic acid in 500 mL of anhydrous tetrahydrofuran (THF) is added 10.3 g (0.050 mol) of 1,3-dicyclohexylcarbodiimide (DCC). After stirring for 10 min, 6.8 g (0.050 mol) of 1-hydroxybenzotriazole (HOBt), 5.5 g (0.045 mol) of phenethyl alcohol and 1.1 g (0.009 mol) of 4-(dimethylamino)pyridine (DMAP) is added and stirred at 0° C. for 1 h, warmed to 22° C. and stirred for an additional 72 h. The mixture is cooled to 0° C., filtered and the solvent is removed under vacuum. The residue is diluted with ethyl acetate and washed three times with saturated sodium bicarbonate, followed by 10% citric acid and brine. The organic layer is dried over anhydrous magnesium sulfate, filtered and concentrated under vacuum to give (E)-3-(2,4-dihydroxyphenyl)-but-2-enoic acid phenethyl ester as a yellow oil that is purified by flash chromatography.

EXAMPLE 3 3-(3-Benzoyl-2,4-dihydroxyphenyl)but-2-Enoic Acid 3,7-dimethyloct-7-enyl Ester

[0064] 8-Benzoyl-7-hydroxy-4-methylchromen-2-one (9) is prepared according to Chem. Ber. 1934, 67,12. included herein by reference.

[0065] The procedure used in Step (1) of Example 1 can be used to convert starting material 9 to intermediate 10.

[0066] A solution of 3-(3-benzoyl-2,4-dihydroxyphenyl)-but-2-enoic acid (5.97 g, 20.0 mmol), citronellol (3.13 g, 20.0 mmol) and p-toluenesulfonic acid (1 g) in cyclohexane (150 mL) is refluxed for 6 h under vacuum using a Dean Stark separator. The reaction mixture is partitioned between methylene chloride (150 mL) and water (150 mL); the organic layer is removed and washed with methylene chloride (100 mL). The combined organic layers are washed sequentially with saturated sodium bicarbonate solution (100 mL) and brine (100 mL). The organic layer is dried over anhydrous magnesium sulfate, filtered and concentrated to give (E)-3-(3-benzoyl-2,4-dihydroxyphenyl)-but-2-enoic acid 3,7-dimethyl-oct-7-enyl ester as an oil which can be purified by flash chromatography.

EXAMPLE 4 3-(2,4,6-trihydroxyphenyl)-Acrylic Acid 3,7-dimethylocta-2,6-dienyl Ester

[0067] Step (1) which is conversion of starting material 12 to intermediate 13 can be a accomplished by the method described in Synthetic Comm. 1991, 21, 351 included herein by reference.

[0068] Step (2) conversion of intermediate 13 3-(2,4,6-trihydroxyphenyl)-acrylic acid 3,7-dimethylocta-2,6-dienyl ester 14.

[0069] A solution of intermediate 13 (1.20 g, 3.7 mmol), thionyl chloride (2 equiv, 0.88 g, 7.4 mmol, 0.54 mL) in anhydrous toluene (50 mL) is refluxed for 3 h under an inert atmosphere. The reaction mixture is evaporated to dryness under vacuum and to the crude acid chloride is added another portion of toluene (50 mL). Geraniol (0.57 g, 3.7 mmol) is added and the reaction mixture is allowed to stir for 12 h. The mixture is diluted with toluene (100 mL) and washed with 100 mL portions of 1 N HCl, water and brine. The organic layer is dried over anhydrous magnesium sulfate, filtered and concentrated to give 3-(2,4,6-triacetoxy-phenyl)-acrylic acid 3,7-dimethyl-octa-2,6-dienyl ester. Removal of the acetoxy units by the method of Synthetic Comm.1991, 21, 351, incorporated herein by reference, affords 3-(2,4,6-trihydroxyphenyl)-acrylic acid 3,7-dimethyl-octa-2,6-dienyl ester.

Fragrance Delivery System

[0070] The present invention relates to a fragrance delivery system for providing an enhanced and enduring fragrance aesthetic benefit using the photo-labile pro-fragrances described herein above.

[0071] The first aspect of the delivery systems relates to systems comprising:

[0072] i) from about 0.001% to about 100%, in another embodiment from about 0.002% to about 20% by weight, of a photo-labile pro-fragrance compound described herein above; and

[0073] ii) optionally from about 0.005% to about 50% by weight, of one or more fragrance raw materials.

[0074] In one embodiment of this aspect, an amount of pro-fragrance is admixed with a fragrance raw material and/or pro-perfume, and the release rates are adjusted such that the amount of fragrance raw material which is released is capable of replenishing any originally formulated fragrance raw material thereby sustaining about the same relative concentration of fragrance raw material.

[0075] The fragrance raw materials which are suitable for optional incorporation into the systems of the present invention are also defined in the herein above incorporated references, as well as P. M. Muller, D. Lamparsky Perfumes Art, Science, & Technology Blackie Academic & Professional, (New York, 1994); and Perfume and Flavor Chemicals, Vols. I and II; Steffen Arctander Allured Pub. Co. (1994) both of which are included herein by reference.

[0076] One embodiment of the present invention relates to a system comprising:

[0077] i) from about 0.001% to about 90% by weight, of a photo-labile pro-fragrance compound described herein above;

[0078] ii) from about 0.005% to about 50% by weight, of one or more fragrance raw materials alcohols which are released by said photo-labile pro-fragrance; and

[0079] iii) the balance a carrier.

[0080] In addition, another aspect of the present invention relates to systems comprising:

[0081] i) from about 0.001% to about 99% by weight, of a photo-labile pro-fragrance compound described herein above;

[0082] ii) from about 0.01% to about 50% by weight, of one or more fragrance raw materials; and

[0083] iii) the balance a carrier.

[0084] Another aspect of the present invention relates to fragrance delivery systems which comprise a combination of photo-labile and non-photo-labile pro-fragrances, said system comprising:

[0085] i) from about 0.001% to about 99.9% by weight, of a photo-labile pro-fragrance compound described herein above;

[0086] ii) from about 0.001% to about 99.9% by weight, of one or more non-photo-labile pro-fragrances selected from the group consisting of cyclic aminals (including oxazolidines and tetrahydro oxazines), β-aminoketones, acetals, ketals, esters, β-ketoesters, orthoesters, orthocarbonates, and mixtures thereof;

[0087] iii) fragrance raw materials alcohols which are released by said photo-labile pro-fragrance; and

[0088] iv) the balance a carrier.

Formulations

[0089] The fragrance delivery systems of the present invention are suitable for use in any laundry detergent matrix, for example, granular, paste, agglomerates, tablets liquids, and the like.

[0090] One aspect of the present invention relates to liquid laundry detergent compositions which provide a stable, flowable liquid matrix. One aspect of the present invention relates to compositions comprising:

[0091] a) from about 0.001% to about 10% by weight, of one or more photo-labile pro-fragrance compound described herein above;

[0092] b) from about 10% by weight, in one embodiment from about 10% to about 80% by weight, in yet another embodiment from about 10% to about 60%, wherein another embodiment comprises from about 15% to about 30% by weight, of a surfactant system, said surfactant system comprising:

[0093] i) from 0.01%, whereas depending upon which aspect or embodiment of the present invention, the following ranges are suitable: from about 0.1% to about 100%; from about 1% to about 80%; from about 1% to about 60%, from about 1% to about 30% by weight, of one or more anionic surfactants, said anionic surfactants selected form the group consisting of linear alkyl benzene sulphonates, mid-chain branched alkyl benzene sulphonates; linear alkyl sulfates, mid-chain branched sulfates, linear alkyleneoxy sulfates, mid-chain branched alkyleneoxy sulfates; and mixtures thereof;

[0094] ii) optionally, from 0.01%, whereas depending upon which aspect or embodiment of the present invention, the following ranges are suitable: from about 0.1% to about 100%; from about 1% to about 80%; from about 1% to about 60%, from about 1% to about 30% by weight, of one or more nonionic surfactants selected from the group consisting of alcohols, alcohol ethoxylates, polyoxyalkylene alkylamides, and mixtures thereof; and

[0095] c) the balance carriers and other adjunct ingredients.

[0096] When the liquid detergent compositions of the present invention are used, the pH of the resulting aqueous solution, upon dilution, will have a value of from about 7 to about 8.5. One embodiment of the present invention has a wash water pH during use of about 8.

[0097] Formulations according to the present invention may comprise a dispersant system which comprises one or more dispersants, said system including one or more hydrophobic soil dispersants according to the present invention. Said mixed dispersant compositions comprise:

[0098] a) from about 0.01% to about 10% by weight, of said detergent composition, a fragrance delivery system, said system comprising:

[0099] i) from about 0.01% to about 90% by weight, of a photo-labile pro-fragrance compound described herein above;

[0100] ii) from about 0.01% to about 50% by weight, of one or more fragrance raw materials alcohols which are released by said photo-labile pro-fragrance; and

[0101] iii) the balance a carrier;

[0102] b) from about 10% by weight, in one embodiment from about 10% to about 80% by weight, in yet another embodiment from about 10% to about 60%, wherein another embodiment comprises from about 15% to about 30% by weight, of a surfactant system according to the present invention; and

[0103] c) the balance carriers and other adjunct ingredients.

[0104] One embodiment of this aspect of the present invention comprises:

[0105] a) from about 0.01% to about 5% by weight, of said liquid laundry detergent composition, a fragrance delivery system, said dispersant system comprising:

[0106] i) from about 0.001% to about 99.9% by weight, of a photo-labile pro-fragrance compound described herein above;

[0107] ii) from about 0.001% to about 99.9% by weight, of one or more non-photo-labile pro-fragrances selected from the group consisting of acetals, ketals, esters, β-ketoesters, orthoesters, orthocarbonates, and mixtures thereof;

[0108] iii) fragrance raw materials alcohols which are released by said photo-labile pro-fragrance; and

[0109] iv) the balance a carrier.

Surfactant System

[0110] The laundry detergent compositions of the present invention comprise a surfactant system. The surfactant systems of the present invention may comprise any type of detersive surfactant, non-limiting examples of which include one or more mid-chain branched alkyl sulfate surfactants, one or more mid-chain branched alkyl alkoxy sulfate surfactants, one or more mid-chain branched aryl sulfonate surfactants, one or more non mid-chain branched sulphonates, sulphates, cationic surfactants, zwitterionic surfactants, ampholytic surfactants, and mixtures thereof.

[0111] The total amount of surfactant present in the compositions of the present invention is from about 10% by weight, in one embodiment of the present invention the range of surfactant is from about 10% to about 80% by weight, of said composition. Another embodiment the amount of surfactant is from about 10% to about 60%, wherein another embodiment comprises from about 15% to about 30% by weight, of said composition.

[0112] Nonlimiting examples of surfactants useful herein include:

[0113] a) C₁₁-C₁₈ alkyl benzene sulfonates (LAS);

[0114] b) C₆-C₁₈ mid-chain branched aryl sulfonates (BLAS);

[0115] c) C₁₀-C₂₀ primary, α or ω-branched, and random alkyl sulfates (AS);

[0116] d) C₁₄-C₂₀ mid-chain branched alkyl sulfates (BAS);

[0117] e) C₁₀-C₁₈ secondary (2,3) alkyl sulfates as described in U.S. Pat. No. 3,234,258 Morris, issued Feb. 8, 1966; U.S. Pat. No. 5,075,041 Lutz, issued Dec. 24, 1991; U.S. Pat. No. 5,349,101 Lutz et al., issued Sep. 20, 1994; and U.S. Pat. No. 5,389,277 Prieto, issued Feb. 14, 1995 each incorporated herein by reference;

[0118] f) C₁₀-C₁₈ alkyl alkoxy sulfates (AEXS) wherein preferably x is from 1-7;

[0119] g) C₁₄-C₂₀ mid-chain branched alkyl alkoxy sulfates (BAE_(x)S);

[0120] h) C₁₀-C₁₈ alkyl alkoxy carboxylates preferably comprising 1-5 ethoxy units;

[0121] i) C₁₂-C₁₈ alkyl ethoxylates, C₆-C₁₂ alkyl phenol alkoxylates wherein the alkoxylate units are a mixture of ethyleneoxy and propyleneoxy units, C₁₂-C₁₈ alcohol and C₆-C₁₂ alkyl phenol condensates with ethylene oxide/propylene oxide block polymers inter alia Pluronic® ex BASF which are disclosed in U.S. Pat. No. 3,929,678 Laughlin et al., issued Dec. 30, 1975, incorporated herein by reference;

[0122] j) C₁₄-C₂₂ mid-chain branched alkyl alkoxylates, BAE_(x);

[0123] k) Alkylpolysaccharides as disclosed in U.S. Pat. No. 4,565,647 Llenado, issued Jan. 26, 1986, incorporated herein by reference;

[0124] l) Pseudoquat surfactants having the formula:

[0125]  wherein R is C₄-C₁₀ alkyl, R¹ is selected from the group consisting of C₁-C₄ alkyl, —(CH₂CHR²O)_(y)H, and mixtures thereof; R² is hydrogen, ethyl, methyl, and mixtures thereof; y is from 1 to 5; x is from 2 to 4; for the purposes of the present invention, a particularly useful pseudoquat surfactant comprises R equal to an admixture of C₈-C₁₀ alkyl, R¹ is equal to methyl; and x equal to 3; these surfactants are described in U.S. Pat. No. 5,916,862 Morelli et al., issued Jun. 29, 1999 included herein by reference;

[0126] m) Polyhydroxy fatty acid amides having the formula:

[0127] wherein R⁷ is C₅-C₃₁ alkyl; R⁸ is selected from the group consisting of hydrogen, C₁-C₄ alkyl, C₁-C₄ hydroxyalkyl, Q is a polyhydroxyalkyl moiety having a linear alkyl chain with at least 3 hydroxyls directly connected to the chain, or an alkoxylated derivative thereof; preferred alkoxy is ethoxy or propoxy, and mixtures thereof. These surfactants are described in U.S. Pat. No. 5,489,393 Connor et al., issued Feb. 6, 1996; and U.S. Pat. No. 5,45,982 Murch et al., issued Oct. 3, 1995, both incorporated herein by reference.

[0128] The mid-chain branched alkyl sulfate surfactants of the present invention have the formula:

[0129] the alkyl alkoxy sulfates have the formula:

[0130] the alkyl alkoxylates have the formula:

[0131] wherein R, R¹, and R² are each independently hydrogen, C₁-C₃ alkyl, and mixtures thereof; provided at least one of R, R¹, and R² is not hydrogen; preferably R, R¹, and R² are methyl; preferably one of R, R¹, and R² is methyl and the other units are hydrogen. The total number of carbon atoms in the mid-chain branched alkyl sulfate and alkyl alkoxy sulfate surfactants is from 14 to 20; the index w is an integer from 0 to 13; x is an integer from 0 to 13; y is an integer from 0 to 13; z is an integer of at least 1; provided w+x+y+z is from 8 to 14 and the total number of carbon atoms in a surfactant is from 14 to 20; R³ is C₁-C₄ linear or branched alkylene, preferably ethylene, 1,2-propylene, 1,3-propylene, 1,2-butylene, 1,4-butylene, and mixtures thereof.

[0132] M denotes a cation, preferably hydrogen, a water soluble cation, and mixtures thereof. Non-limiting examples of water soluble cations include sodium, potassium, lithium, ammonium, alkyl ammonium, and mixtures thereof.

[0133] The following are non-limiting examples of shampoo compositions according to the present invention. TABLE I weight % Ingredients 5 6 7 8 Ammonium laureth-3 sulfate 10.00  10.00  10.00  10.00  Ammonium lauryl sulfate 6.00 2.00 2.00 2.00 Cocamidopropyl betaine FB — 2.00 2.00 2.00 Sodium lauraoamphoacetate — 2.00 2.00 2.00 Cetyl alcohol 0.90 0.60 0.60 0.60 Cocamide MEA 0.80 0.80 0.80 0.80 Polyquat 10 ¹ 0.50 0.50 0.50 0.50 Ethylene glycol distearate 1.50 1.50 0.75 1.50 Dimethicone ² 2.00 — — — Dimethicone ³ — 2.00 1.00 1.00 PPG 15 stearyl ether ⁴ 2.00 2.00 2.00 2.00 Mobil P43 synthetic oil ⁵ 0.10 — — — Puresyn 6 (MCP-1812) ⁶ 0.40 — — 0.25 Perfume solution ⁷ 0.70 0.70 0.70 0.70 Sodium citrate 0.40 0.40 0.40 0.40 Citric acid 0.04 0.40 0.40 0.40 Ammonium xylene sulfonate — 1.70 1.50 1.50 Sodium chloride 0.50 — — — Pro-fragrance ⁸ 1.00 1.00 1.25 0.50 Water/Carriers/aesthetics balance balance balance balance

[0134] TABLE II weight % Ingredients 9 10 11 12 Ammonium laureth-3 sulfate 10.00  11.70  10.00  10.00  Ammonium lauryl sulfate 5.00 2.30 2.00 2.00 Cocamidopropyl betaine FB — — 2.00 2.00 Sodium lauraoamphoacetate — — 2.00 2.00 Cocaminopropionic acid 3.00 2.00 — — Cetyl alcohol 0.90 0.60 0.60 0.60 Cocamide MEA 0.80 0.80 0.80 0.80 Polyquat 10 ¹ 0.50 0.50 0.50 0.50 Ethylene glycol distearate 1.50 1.50 0.75 1.50 Dimethicone ² 2.00 2.00 2.00 2.00 PPG 15 stearyl ether ³ 2.00 2.00 1.00 2.00 Varisoft CB110 ⁴ — — — 0.15 Perfume solution ⁵ 0.70 0.70 0.70 0.70 Sodium citrate 0.40 0.40 0.40 0.40 Citric acid 0.04 0.40 0.40 0.40 Ammonium xylene sulfonate — 1.70 1.50 1.50 Sodium chloride 0.50 — — — Pro-fragrance ⁶ 1.00 1.00 1.25 0.50 Water/Carriers/aesthetics balance balance balance balance

[0135] The following are non-limiting examples of liquid laundry detergent compositions according to the present invention. TABLE III weight % Ingredients 13 14 15 16 C₁₂-C₁₅ alkyl E₁₁ sulfate 18.0  14.4  18.0  — Linear alkyl benzene sulphonate 2.40 4.44 5.8 15   C₁₂-C₁₃ alkyl alcohol 2.40 2.22 2.8 8.4 C₁₀-C₁₂ alkyl psuedo quat. ¹ 1.20 — — — C₈-C₁₀ APA — — 1.4 1.4 Amine oxide — 0.74 — — Citric acid 2.80 2.59 2.5 1.0 C₁₂-C₁₈ alkyl fatty acid ² 3.20 2.96 5.0 10   Enzymes 3.77 2.83  3.25  3.25 Chelant ³ 0.15 0.15  0.15  0.15 Photo-labile pro-fragrance ⁴ 0.22  0.025 1.5  0.005 Pro-fragrance 1.00 — — — Perfume raw material 0.20 0.25 1.2  0.050 Water/Carriers/aesthetics balance balance balance balance

[0136] The following are non-limiting examples of a light duty liquid dishwashing detergent according to the present invention. TABLE IV weight % Ingredients 17 18 19 20 C₁₂-C₁₄ alkyl E₁₄ sulfate 24.69  33.50  34.20  — C₁₂-C₁₄ alkyl E₂₂ sulfate — — — 28.80  Glucose amide ¹ 3.09 6.00 4.20 1.43 C₁₂-C₁₄ alkyl 2.06 6.00 4.81 4.94 dimethyl N-oxide C₁₂ dimethyl 2.06 — — — carboxymethyl amine ² C₁₀ E₈ alcohol 4.11 — — — C₁₁ E₉ alcohol — 1.00 1.00 0.95 Magnesium ³ 0.49 0.80 0.72 0.68 Calcium ⁴ — 0.40 0.35 0.33 Ethanol 7.50 5.00 5.25 5.85 Hydrotrope ⁵ 4.47 4.00 3.50 4.75 Photo-labile 0.50 0.25  0.035 1.25 pro-fragrance ⁶ Pro-fragrance — — — 0.10 Perfume raw material 1.20 0.75 0.25 — Carriers/aesthetics balance balance balance balance Viscosity (cps) 150    300    300    300    pH of a 10% aqueous 7.8  7.8  7.4  7.4  solution

[0137] The laundry detergent compositions of the present invention can be suitably prepared by any process chosen by the formulator, non-limiting examples of which are described in U.S. Pat. No. 5,691,297 Nassano et al., issued Nov. 11, 1997; U.S. Pat. No. 5,574,005 Welch et al., issued Nov. 12, 1996; U.S. Pat. No. 5,569,645 Dinniwell et al., issued Oct. 29, 1996; U.S. Pat. No. 5,565,422 Del Greco et al., issued Oct. 15, 1996; U.S. Pat. No. 5,516,448 Capeci et al., issued May 14, 1996; U.S. Pat. No. 5,489,392 Capeci et al., issued Feb. 6, 1996; U.S. Pat. No. 5,486,303 Capeci et al., issued Jan. 23, 1996 all of which are incorporated herein by reference.

[0138] A personal care cleanser composition is prepared by combining the following ingredients using conventional mixing techniques. TABLE V Weight % Ingredients 21 22 23 24 Phase A Water QS 100 QS 100 QS 100 QS 100 Disodium EDTA 0.100 0.100 0.100 0.100 Glycerin 4.00  4.00  4.00  4.00  Methylparaben 0.200 0.200 0.200 0.200 C₁₀-C₃₀ alkyl acrylate 0.150 0.150 0.150 0.150 crosspolymer ¹ Carbomer 954 ² 0.250 0.250 0.250 0.250 Phase B Stearic Acid 0.110 0.110 0.110 0.110 Stearyl alcohol 0.875 0.875 0.875 0.875 Cetyl alcohol 0.875 0.875 0.875 0.875 Propylparaben 0.150 0.150 0.150 0.150 Steareth-2 — 0.25  0.25  0.25  Steareth-21 — 0.50  0.50  0.50  Phase C Sodium hydroxide ³ 0.130 0.130 0.130 0.130 Phase D Diisopropyl sebacate 1.50  1.50  1.50  1.50  Isohexadecane 5.00  2.00  5.00  5.00  Mineral Oil ⁴ — 5.00  — — Phase E Phenoxyethanol 0.5  0.5  — 0.5  Photo-labile pro-fragrance ⁵ 0.75  0.90  1.00  1.25  Pro-accord ⁶ — — 2.20  0.50  Perfume raw material 1.0  0.20  3.0  1.5  Phase F Glucose amide 0.96  0.96  0.96  0.96 

[0139] The above Examples 13-16 can be suitably prepared as follows. In a suitable vessel, the Phase A ingredients are mixed at room temperature to form a dispersion and heated with stirring to 70-80° C. In a separate vessel, the Phase B ingredients are heated with stirring to 70-80° C. Phase B is then added to Phase A with mixing to form the emulsion. Next, Phase C is added to neutralize the composition. The Phase D ingredients are added with mixing, followed by cooling to 45-50° C. The Phase E ingredients are then added with stirring, followed by cooling to 40° C. Phase F is heated with mixing to 40° C. and added to the emulsion, which is cooled to room temperature. The resulting cleansing composition is useful for cleansing the skin. The emulsion de-emulsifies upon contact with the skin.

[0140] The following is a non-limiting example of a fine fragrance system according to the present invention. Table VI Weight % Ingredients 25 26 27 28 Pro-fragrance ¹ 0.4  0.1 — — Pro-fragrance ² — 0.4 — — Pro-fragrance ³ — 0.5 — — Photo-labile pro-fragrance ⁴ 0.03 0.5  1  5 δ-Damascone —  0.01 trace — Geraniol —  0.03 trace — 9-Decen-1-ol —  0.03 — — Coumarin —  0.005 — — Other free fragrance raw 14    17   15 12 materials ⁵ Carrier 6 balance balance balance balance

[0141] 1. Pro-fragrance which releases δ-damascone, for example

[0142] 2. Pro-fragrance which releases geraniol; for example

[0143] 3. Pro-fragrance which releases 9-decen-1-ol; for example

[0144] 4. According to Example 1.

[0145] 5. Conventional fragrance accord.

[0146] 6. Ethanol:water mixture (between 100:0 and 50:50). 

What is claimed is:
 1. A photo-labile pro-fragrance having the formula:

wherein —OR is a unit derived from a fragrance raw material alcohol, HOR; R¹ is one or more electron donating groups; each R² is independently hydrogen, C₁-C₁₂ alkyl, C₇-C₁₂ alkylenearyl; and mixtures thereof; X is selected from the group consisting of —OH, —NH₂, —NHR³, and mixtures thereof; R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, C₇-C₁₂ alkylenearyl, and mixtures thereof.
 2. A compound according to claim 1 wherein R¹ is —N(R³)₂, —NHR³, —NH₂, —OH, and —OR³ wherein R³ is C₁-C₁₂ linear or branched alkyl, phenyl, benzyl, and mixtures thereof.
 3. A compound according to claim 1 wherein R¹ is —NHC(O)R³, —NR³C(O)R³, —OC(O)R³, —R³, —CH═C(R³)₂, wherein R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, and C₇-C₁₂ alkylenearyl.
 4. A compound according to claim 1 wherein X is —OH.
 5. A compound according to claim 1 wherein X is —NH₂.
 6. A compound according to claim 1 wherein X is —NHR³.
 7. A compound according to claim 1 having the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 8. A compound according to claim 1 having the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 9. A compound according to claim 1 having the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 10. A compound according to claim 1 having the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 11. A compound according to claim 1 having the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 12. A compound according to claim 1 wherein R is selected from the group consisting of 1,5-dimethyl-1-vinylhex-4-enyl, 3,7-dimethyloct-7-enyl, 3,7-dimethyloctan-3-yl, and 2-methyl-6-methylene-7-octen-2-yl.
 13. A compound according to claim 1 wherein —OR is derived from a terpene alcohol selected from the group consisting of geraniol, nerol, eugenol, isoeugenol, citronellol, menthol, isopulegol, terpineol, borneol, isoborneol, linalool, tetrahydrolinalool, myrcenol, dihydromyrcenol, muguol, farnesol and mixtures thereof.
 14. A compound according to claim 1 wherein —OR is derived from a non-terpene alcohol selected from the group consisting of cinnamyl alcohol, methylcinnamyl alcohol, Majantol, Hydrotropic alcohol, nopol, Lavandulol, carvenol, cuminyl alcohol, thymol, and mixtures thereof.
 15. A personal care composition having sustained fragrance, said composition comprising: a) from about 0.001% to about 50% by weight, of a photo-labile pro-fragrance compound having the formula:

 wherein OR is a unit derived from a fragrance raw material alcohol, HOR; R¹ is one or more electron donating groups; each R² is independently hydrogen, C₁-C₁₂ alkyl, and mixtures thereof; X is selected from the group consisting of —OH, —NH₂, —NHR³, and mixtures thereof; R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, and mixtures thereof; b) optionally from about 0.001% to about 50% by weight, of one or more fragrance raw materials; and c) the balance carriers and adjunct ingredients.
 16. A composition according to claim 15 wherein said R¹ is hydroxy, C₁-C₁₂ linear or branched alkoxy, and mixtures thereof.
 17. A composition according to claim 16 wherein X is hydroxy and R¹ is hydroxy.
 18. A composition according to claim 17 wherein R¹ is 4-hydroxy.
 19. A composition according to claim 18 wherein R² is hydrogen or methyl.
 20. A composition according to claim 15 wherein the photo-labile pro-fragrance has the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 21. A composition according to claim 15 wherein the photo-labile pro-fragrance has the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 22. A composition according to claim 15 wherein the photo-labile pro-fragrance has the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 23. A composition according to claim 15 wherein the photo-labile pro-fragrance has the formula:

wherein OR derives from a fragrance raw material alcohol selected from the group consisting of 4-(1-methylethyl)cyclohexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-ol, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 24. A composition according to claim 15 wherein R is derived from a terpene alcohol selected from the group consisting of geraniol, nerol, eugenol, isoeugenol, citronellol, menthol, isopulegol, terpineol, borneol, isoborneol, linalool, tetrahydrolinalool, myrcenol, dihydromyrcenol, muguol, farnesol and mixtures thereof.
 25. A composition according to claim 15 wherein R is derived from a non-terpene alcohol selected from the group consisting of cinnamyl alcohol, methylcinnamyl alcohol, Majantol, Hydrotropic alcohol, nopol, Lavandulol, carvenol, cuminyl alcohol, thymol, and mixtures thereof.
 26. A composition according to claim 15 wherein R is derived from a blossom alcohol selected from the group consisting of 4-(1-methylethyl)cyclo-hexanemethanol, 2,4-dimethyl-3-cyclohexen-1-ylmethanol, 2,4-dimethylcyclohex-1-ylmethanol, 2,4,6-trimethyl-3-cyclohexen-1-ylmethanol, 2-phenylethanol, 1-(4-isopropylcyclohexyl)ethanol, 2-(o-methylphenyl)ethanol, 2-(m-methylphenyl)ethanol, 2-(p-methylphenyl)-ethanol, 2,2-dimethyl-3-(3-methylphenyl)propan-1-ol, 3-phenyl-2-propen-1-ol, 2-methyl-4-(2,2,3-trimethyl-3-cyclopenten-1-yl)-2-buten-1-ol, 3-methyl-5-phenylpentan-1-ol, 3-methyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol, 2-methyl-4-phenylpentan-1-ol, cis-3-hexen-1-ol, 3,7-dimethyl-6-octen-1-o, 3,7-dimethyl-2,6-octadien-1-ol, 7-methoxy-3,7-dimethyloctan-2-ol, 6,8-dimethylnonan-2-ol, cis-6-nonen-1-ol, 2,6-nonadien-1-ol, 4-methyl-3-decen-5-ol, benzyl alcohol, 2-methoxy-4-(1-propenyl)phenol, 2-methoxy-4-(2-propenyl)phenol, 4-hydroxy-3-methoxybenzaldehyde, and mixtures thereof.
 27. A laundry detergent composition comprising: a) from 0.001% to 10% by weight, of a fragrance delivery system, said system comprising: i) from about 0.001% to about 100% by weight, of a photo-labile pro-fragrance compound having the formula:

 wherein OR is a unit derived from a fragrance raw material alcohol, HOR; R¹ is one or more electron donating groups; each R² is independently hydrogen, C₁-C₁₂ alkyl, and mixtures thereof; X is selected from the group consisting of —OH, —NH₂, —NHR³, and mixtures thereof; R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, and mixtures thereof; ii) optionally from about 0.001% to about 50% by weight, of one or more fragrance raw materials; b) from about 10% to about 80% by weight, of a surfactant system; and c) the balance carriers and other adjunct ingredients.
 28. A composition according to claim 27 wherein said surfactant system comprises: i) from 0.01% by weight, of a surfactant selected from the group consisting of alkyl sulfate surfactants, alkoxy sulfate surfactants, mid-chain branched alkyl sulfate surfactants, mid-chain branched alkoxy sulfate surfactants, mid-chain branched aryl sulfonate surfactants, and mixtures thereof; ii) from 0.01% by weight, of one or more aryl sulphonate anionic surfactants; iii) from 0.01% by weight, of one or more nonionic surfactants.
 29. A laundry softener composition comprising: a) from 0.001% to 10% by weight, of a fragrance delivery system, said system comprising: i) from about 0.001% to about 100% by weight, of a photo-labile pro-fragrance compound having the formula:

 wherein OR is a unit derived from a fragrance raw material alcohol, HOR; R¹ is one or more electron donating groups; each R² is independently hydrogen, C₁-C₁₂ alkyl, and mixtures thereof; X is selected from the group consisting of —OH, —NH₂, —NHR³, and mixtures thereof; R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, and mixtures thereof; ii) optionally from about 0.001% to about 50% by weight, of one or more fragrance raw materials; b) from about 10% to about 80% by weight, of a softener system; and c) the balance carriers and other adjunct ingredients.
 30. A shampoo composition having sustained fragrance, said composition comprising: a) from about 0.001% to about 50% by weight, of a photo-labile pro-fragrance compound having the formula:

 wherein OR is a unit derived from a fragrance raw material alcohol, HOR; R¹ is one or more electron donating groups; each R² is independently hydrogen, C₁-C₁₂ alkyl, and mixtures thereof; X is selected from the group consisting of —OH, —NH₂, —NHR³, and mixtures thereof; R³ is hydrogen, C₁-C₁₂ linear or branched alkyl, C₆-C₁₀ aryl, and mixtures thereof; b) optionally from about 0.001% to about 50% by weight, of one or more fragrance raw materials; and c) the balance carriers and adjunct ingredients. 